JP5550677B2 - 永久磁石バルク消磁装置 - Google Patents
永久磁石バルク消磁装置 Download PDFInfo
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- JP5550677B2 JP5550677B2 JP2012121350A JP2012121350A JP5550677B2 JP 5550677 B2 JP5550677 B2 JP 5550677B2 JP 2012121350 A JP2012121350 A JP 2012121350A JP 2012121350 A JP2012121350 A JP 2012121350A JP 5550677 B2 JP5550677 B2 JP 5550677B2
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
- G11B5/024—Erasing
- G11B5/0245—Bulk erasing
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F13/00—Apparatus or processes for magnetising or demagnetising
- H01F13/006—Methods and devices for demagnetising of magnetic bodies, e.g. workpieces, sheet material
Description
Claims (7)
- 少なくとも2対の磁石群であって、
前記磁石群の各々は、少なくとも3つのセグメントを含み、
前記セグメントの各々は、前記セグメントの最長寸法にほぼ垂直な向きに磁化され、
前記磁石群の各々は、各後続のセグメントの前記磁化の向きが前のセグメントに対して約90度回転された状態で前記セグメントが隣接して配列されるように構成される磁石群と、
各群によって生成される磁場が少なくとも部分的に前記間隙内に存在するように磁石群の各対によって定められ、通過する磁気記憶媒体が少なくとも部分的には記憶消去されるようなサイズである間隙であって、
前記少なくとも2対の磁石群の少なくとも1対は、第1の磁石群の前記セグメントが、第2の磁石群の前記セグメントに対して90度で配列され、両方の磁石群の前記セグメントが、磁石群の各対によって定められた各間隙を通る磁気記憶媒体経路に対して45度の角度となるように構成されている間隙と
を備え、
前記少なくとも2対の磁石群の少なくとも1対は、前記少なくとも2対の磁石群の少なくとも1対のセグメントが前記間隙を挟んで整列し、前記セグメントの各々が、前記間隙を直接挟む前記セグメントの前記磁化の向きを鏡映するように配列され、
前記少なくとも3つのセグメントの少なくとも1つは、前記セグメント内の各永久磁石が同じ方向を向くよう磁化されるように、少なくとも1列で構成された複数の永久磁石を含み、
前記永久磁石の少なくとも1つは、正方形の形状の断面と、前記正方形の一辺の長さの半分の高さとを含み、磁化の向きは前記永久磁石の前記高さの方向であることを特徴とする磁性記憶媒体を記憶消去する装置。 - 前記磁気記憶媒体経路上に配置された追加の前記磁石群の少なくとも1対をさらに備え、
前記追加の少なくとも1対の前記磁石群の各々は、少なくとも3つのセグメントを含み、
前記追加の少なくとも1対の前記磁石群の前記セグメントの各々は、前記セグメントの最長寸法にほぼ垂直な向きに磁化され、
前記追加の少なくとも1対の前記磁石群の各々は、各後続のセグメントの前記磁化の向きが前のセグメントに対して約90度回転された状態で前記セグメントが隣接して配列されるように構成され、
前記追加の前記磁石群の少なくとも1対は、引き付け合うように配置されている
ことを特徴とする請求項1に記載の装置。 - さらに、磁気記憶媒体が少なくとも部分的には記憶消去されるように、前記間隙とともに磁気記憶媒体が通過することができる、前記磁石群を構成中に固定するフレーム構造を備えたことを特徴とする請求項1に記載の装置。
- 前記フレーム構造は、調節可能であることを特徴とする請求項3に記載の装置。
- 前記連続するセグメントの各々は、第1の幅と第2の幅とを交互に繰り返すことを特徴とする請求項1に記載の装置。
- 前記第1の幅は、第2の幅のほぼ半分であることを特徴とする請求項5に記載の装置。
- 各群によって生成される磁場と相互作用することによって、通過する磁気記憶媒体が少なくとも部分的には記憶消去されるように磁石群の少なくとも1対で定められる間隙を通って、磁気記憶媒体を通過させるステップ
を備え、
前記磁石群の各々は、少なくとも3つのセグメントを含み、前記セグメントの各々は、前記セグメントの最長寸法にほぼ垂直な向きに磁化され、
前記磁石群の少なくとも1つは、各後続のセグメントの前記磁化の向きが前のセグメントに対して約90度回転された状態で前記セグメントが隣接して配列されるように構成され、
前記連続するセグメントの各々は、前記磁気記憶媒体の媒体移動の方向についての第1の幅と第2の幅とを交互に繰り返し、
前記セグメントの少なくとも1つに関する前記磁化の向きは、前記間隙にほぼ垂直またはほぼ平行であり、
前記磁石群の各対は、同数のセグメントを含み、
前記磁石群の各対は、前記磁石群の各々からのセグメントが前記間隙を挟んで整列し、前記セグメントの各々が、前記間隙を直接挟む前記セグメントの前記磁化の向きを鏡映するように配列され、
前記少なくとも3つのセグメントの少なくとも1つは、前記セグメント内の各永久磁石が同じ方向を向くよう磁化されるように、少なくとも1列で構成された複数の永久磁石を含み、
前記永久磁石の少なくとも1つは、正方形の形状の断面と、前記正方形の一辺の長さの半分の高さとを含み、磁化の向きは前記永久磁石の前記高さの方向であることを特徴とする磁気記憶媒体を記憶消去する方法。
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/897,882 US20060018075A1 (en) | 2004-07-23 | 2004-07-23 | Permanent magnet bulk degausser |
US10/897,882 | 2004-07-23 |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2005213205A Division JP5042474B2 (ja) | 2004-07-23 | 2005-07-22 | 永久磁石バルク消磁装置 |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2012195048A JP2012195048A (ja) | 2012-10-11 |
JP5550677B2 true JP5550677B2 (ja) | 2014-07-16 |
Family
ID=35149389
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JP2005213205A Active JP5042474B2 (ja) | 2004-07-23 | 2005-07-22 | 永久磁石バルク消磁装置 |
JP2012121350A Active JP5550677B2 (ja) | 2004-07-23 | 2012-05-28 | 永久磁石バルク消磁装置 |
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Application Number | Title | Priority Date | Filing Date |
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JP2005213205A Active JP5042474B2 (ja) | 2004-07-23 | 2005-07-22 | 永久磁石バルク消磁装置 |
Country Status (5)
Country | Link |
---|---|
US (2) | US20060018075A1 (ja) |
EP (1) | EP1619667B1 (ja) |
JP (2) | JP5042474B2 (ja) |
AT (1) | ATE496367T1 (ja) |
DE (1) | DE602005025963D1 (ja) |
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-
2004
- 2004-07-23 US US10/897,882 patent/US20060018075A1/en not_active Abandoned
-
2005
- 2005-07-22 JP JP2005213205A patent/JP5042474B2/ja active Active
- 2005-07-22 EP EP05016028A patent/EP1619667B1/en active Active
- 2005-07-22 AT AT05016028T patent/ATE496367T1/de not_active IP Right Cessation
- 2005-07-22 DE DE602005025963T patent/DE602005025963D1/de active Active
-
2008
- 2008-02-01 US US12/024,820 patent/US7593210B2/en active Active
-
2012
- 2012-05-28 JP JP2012121350A patent/JP5550677B2/ja active Active
Also Published As
Publication number | Publication date |
---|---|
EP1619667A2 (en) | 2006-01-25 |
ATE496367T1 (de) | 2011-02-15 |
EP1619667A3 (en) | 2007-05-02 |
JP2012195048A (ja) | 2012-10-11 |
US20080180203A1 (en) | 2008-07-31 |
US7593210B2 (en) | 2009-09-22 |
JP5042474B2 (ja) | 2012-10-03 |
JP2006040517A (ja) | 2006-02-09 |
EP1619667B1 (en) | 2011-01-19 |
US20060018075A1 (en) | 2006-01-26 |
DE602005025963D1 (de) | 2011-03-03 |
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